anchor

README

Anchor

A protocol that allow switching proxy info in Lan.

Forked from SagerNet/SagerConnect

Warn

I know nothing about L4 proxies and transparent proxies, and this is my first time to something about them. So this software is for educational and research purposes only. Please do not use it for illegal activities or in production environments.

Developing

Build

CGO_ENABLED=0 make

Format

make fmt

Protocol

• All use Big Endian.

• Target port is 45947, which generated randomly.

Query:

Version	Device Name Length	Device Name
1	1	0 to 128

• Version: always constant 0x02

Response:

Version	Dns Port	Device Name Length	Device Name	Socks Port
1	2	1	0 to 128	2

• Version: always constant 0x02
• Dns Port: can be zero, which means server not providing dns port.

Credits

Inspired by: SagerNet/SagerConnect

• SagerNet/sing-tun
• SagerNet/sing-box

Documentation

Overview

Package anchor provides an API that allow switching the proxy info.

Index

• Constants
• type Query
  • func ParseQuery(reader io.Reader) (*Query, error)
  • func (q Query) Length() (length int)
  • func (q Query) MarshalBinary() ([]byte, error)
• type Response
  • func ParseResponse(reader io.Reader) (*Response, error)
  • func (r Response) Length() (length int)
  • func (r Response) MarshalBinary() ([]byte, error)

Constants

const (
	Version = 0x02
	Port    = 45947

	MaxDeviceName   = 128
	MinQuerySize    = 1 + 1 + 0                     // 2
	MaxQuerySize    = 1 + 1 + 128                   // 130
	MinResponseSize = 1 + 2 + 1 + 0 + 2             // 6
	MaxResponseSize = 1 + 2 + 1 + MaxDeviceName + 2 // 134
)

Types

type Query

type Query struct {
	Version    uint8
	DeviceName string
}

func ParseQuery

func ParseQuery(reader io.Reader) (*Query, error)

func (Query) Length

func (q Query) Length() (length int)

func (Query) MarshalBinary

func (q Query) MarshalBinary() ([]byte, error)

type Response

type Response struct {
	Version    uint8
	DnsPort    uint16
	DeviceName string
	SocksPort  uint16
}

func ParseResponse

func ParseResponse(reader io.Reader) (*Response, error)

func (Response) Length

func (r Response) Length() (length int)

func (Response) MarshalBinary

func (r Response) MarshalBinary() ([]byte, error)